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A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment
12:18

A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment

Published on: January 11, 2020

Outcomes of incident mild cognitive impairment in relation to case definition

J D Fisk1, K Rockwood

  • 1Division of Geriatric Medicine, Department of Medicine, Dalhousie University, Halifax, NS, Canada.

Journal of Neurology, Neurosurgery, and Psychiatry
|July 19, 2005
PubMed

Insights

Varying definitions of mild cognitive impairment (MCI) impact dementia risk, with subjective memory complaints showing the highest risk. However, a significant portion of MCI cases recover, highlighting its heterogeneous nature.

Area of Science:

  • Gerontology
  • Neurology
  • Epidemiology

Background:

  • Definitions for mild cognitive impairment (MCI) lack standardization, leading to inconsistent research findings.
  • Existing case definitions influence prevalence but not necessarily outcomes in already identified prevalent MCI cases.

Purpose of the Study:

  • To investigate if variations in mild cognitive impairment (MCI) case definitions affect adverse outcomes in incident MCI cases.
  • To evaluate the impact of different MCI diagnostic criteria on the 5-year risks of mortality, institutionalization, and dementia development.

Main Methods:

  • Utilized data from the Canadian Study of Health and Aging, focusing on clinically examined incident MCI cases.
  • Systematically altered MCI case definitions by including or relaxing criteria from consensus guidelines.
  • Calculated relative risks (RR) for adverse outcomes (death, institutionalization, dementia) across varied MCI definitions.

Main Results:

  • MCI case definitions requiring subjective memory complaints were associated with the highest relative risks for dementia (RR = 26.4-38.7).
  • All evaluated MCI definitions increased dementia risk, yet 20-30% of survivors showed no cognitive impairment at follow-up.
  • Mild cognitive impairment (MCI) was identified as a heterogeneous transitional state with considerable recovery rates irrespective of the definition used.

Conclusions:

  • The definition of mild cognitive impairment (MCI) significantly influences the perceived risk of adverse outcomes, particularly dementia.
  • Despite increased dementia risk, a substantial proportion of individuals diagnosed with MCI experience recovery, indicating heterogeneity in its progression.
  • Further research is needed to identify factors promoting recovery and preventing progression in mild cognitive impairment (MCI).

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